EP3101216B1 - Boring head for rotary boring - Google Patents
Boring head for rotary boring Download PDFInfo
- Publication number
- EP3101216B1 EP3101216B1 EP15170073.9A EP15170073A EP3101216B1 EP 3101216 B1 EP3101216 B1 EP 3101216B1 EP 15170073 A EP15170073 A EP 15170073A EP 3101216 B1 EP3101216 B1 EP 3101216B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mount face
- face
- boring head
- guide block
- mount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000463 material Substances 0.000 claims description 18
- 239000011435 rock Substances 0.000 claims description 13
- 238000005520 cutting process Methods 0.000 description 18
- 238000009825 accumulation Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/10—Roller bits with roller axle supported at both ends
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/28—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with non-expansible roller cutters
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D3/00—Raising shafts, i.e. working upwards from the bottom
Definitions
- the present invention relates to a raise boring head and in particular, although not exclusively, to a boring head having a mount face to mount a plurality of roller cutters with at least one guide block projecting from the mount face to facilitate the transport of cut material away from the mount face.
- Raise boring operations may be performed in a mine or other underground works to provide access or to create ventilation shafts.
- the technique typically involves drilling a small diameter pilot hole from a first location to a second location. Once completed, the pilot bit is removed and a large diameter raise boring head is mounted at the drive shaft, with the shaft having a diameter corresponding to that of the pilot hole. The raise head is rotated and drawn upwardly along the pilot hole so as to enlarge the initial hole to the desired diameter.
- the raise boring head includes replaceable roller cutters distributed over a mount face of the head that act to disintegrate the rock as they rotate independently. Accordingly, the distribution and configuration of the cutters at the boring head may be adapted in an attempt to maximise cutting performance whilst extending, as far as possible, their operational lifetime.
- Conventional raise bore apparatus is described in US 4,228,863 ; US 4,386,670 and US 4,381,038 .
- the subject invention provides a raise boring head in which a face of a body that mounts the roller cutters comprises at least one or a plurality of guide blocks that project from the mount face.
- the guide blocks each comprise at least one guide surface being aligned transverse to the mount face of the body to facilitate the rearward transport of cut material during boring.
- the body of the boring head may comprise one or a plurality of open channels extending axially through the body from the mount face to a rear face with a corresponding guide block positioned immediately adjacent the open end of the channel so as to direct or funnel cut material into the channel to fall under gravity downwardly away from the cutters.
- a raise boring head for rotary boring in rock comprising: a body mountable at a drive shaft, the body having a mount face to extend radially outward from the shaft; a plurality of saddles provided at the mount face to rotatably mount respective roller cutters at the body; characterised by: at least one guide block attached to the body to project from the mount face at a position adjacent or spaced apart from the saddles, the guide block having at least one guide face aligned transverse to the mount face to facilitate the transport of cut material away from the mount face.
- the 'mount face' of the body encompasses a surface region of the body that is aligned generally perpendicular to the drive shaft and accordingly a central axis extending through the boring head and the drive shaft.
- the mount face may however be aligned transverse to the central axis so as to be inclined or declined relative to the drive shaft.
- the mount face may be formed as a generally planar surface region having one or a plurality openings or holes that represent open ends of the debris flow channels that extend axially through the body from the mount face to a rear face.
- the mount face therefore may be formed as sections or regions of a grid or lattice structure that support the saddles and roller cutters.
- a raise boring head that may be extendable and formed as a modular, segmented reaming head.
- the boring head may be formed as an integral reaming head in which a single body is mounted directly to the drive shaft.
- the raise boring head is extendable, the drive shaft is mounted at the extension bodies indirectly.
- the roller cutters and saddles are mounted at the head such that the uppermost cutting region of the cutters are aligned at the same axial height (relative to the drive shaft) and separation distance from the mount face.
- Such an arrangement is advantageous to promote uniform wear of the cutters at the different radial positions on the mount face.
- the guide face is generally planar and inclined relative to the mount face.
- the guide face may be curved relative to the mount face or comprise a curved region.
- the inclined or curved mount face acts to provide a surface over which the cuttings can pass (slide) under gravity as they are cut and ejected from the rock face by the rotating cutters.
- the inclination or curvature also acts to direct the cuttings to a particular discharge location such as over an inner or outer peripheral edge of the body or through an open channel extending axially through the body.
- the guide block is separate to and formed non-integrally with the saddles.
- the boring head further comprises at least one attachment bolt to secure the guide block to the mount face.
- Such an arrangement is advantageous to allow convenient and adjustable interchange and potential repositioning of the guide block(s) at the mount face to suit particular distributions of roller cutters at the body.
- each of the saddles are secured to the mount face via attachment bolts that are separate and independent to the attachment of the at least one guide block to the mount face via at least one respective attachment bolt.
- the guide blocks may be secured to the mount face by a weld material. Additionally, the guide blocks may be secured by any other permanent or reasonable attachment mechanisms including locking pins, tongue and groove arrangements, twist lock engagements, bayonet fixings etc.
- the guide block projects from the mount face by a distance that is less than a distance by which at least some of the saddles project from the mount face.
- the guide block projects from the mount face by a distance that is less than a distance by which the closest neighbouring saddle to the guide block projects from the mount face.
- at least some of the saddles may be recessing into the mount face.
- the guide block projects from the mount face by a distance that is less than a distance by which each of the roller cutters project from the mount face.
- the at least one guide block comprises a height that is less than half of the height of a saddle such that the roller cutters are mounted to stand proud of the guide blocks.
- the at least one guide block projects from the mount face by a distance that is 10 to 50%, 15 to 45% or 25 to 40% of a distance by the saddles project from the mount face.
- the at least one guide block may project from the mount face by a distance that is 10 to 50%, 15 to 45% or 25 to 40% of a distance by the roller cutters project from the mount face.
- the boring head comprises one or a plurality of open channels extending axially through the body from the mount face to a rear face.
- the guide block or a plurality of guide block are positioned at the mount face adjacent an open end of the channel(s) to deflect cut material into the channel for transport from the mount face to the rear face.
- a single guide block may be positioned laterally to one side of each open end of the channel or a plurality of guide blocks may be positioned adjacent the channel open end.
- the guide block may be positioned at or towards a perimeter edge of the mount face representing the radially outermost region of a boring head.
- the guide block may be positioned at a radially inner region of the mount face adjacent the drive shaft.
- Such configurations can accordingly be optimised to maximise the through transport of cuttings away from the mount face at zones where debris accumulation may be problematic due to a particular distribution of roller cutters at the body.
- the guide blocks are positioned at the mount face circumferentially or radially between the saddles where the saddles may be distributed at the same or different respective circumferential and radial spacing relative to one another.
- the guide blocks may be positioned asymmetrically or symmetrically at the mount face with respect to the distribution of roller cutters (and saddles).
- the body may comprise a main body (or hub) and at least one extension body removably mounted to a lateral side of the main body, the extension body having a corresponding mount face to provide a radial extension of the mount face of the main body.
- the boring head may comprise the same or different extension bodies mountable at the lateral sides of the main body.
- the boring head comprises a plurality of a first type of extension bodies and a plurality of a second type of extension bodies so as to radially extend the mount face and the operative cutting diameter of the boring head.
- the present raise boring head may be extendable and may be formed as a modular, segmented reaming head.
- the boring head may be formed as an integral reaming head in which a single body mounts a plurality of roller cutters and one or a plurality of guide blocks.
- the boring head may comprise a guide block or a plurality of guide blocks positioned at the mount face of the main body and/or the extension body radially inside or radially outside the saddles.
- a guide block or a plurality of guide blocks positioned at the mount face of the main body and/or the extension body radially inside or radially outside the saddles.
- the guide block according to the subject invention may comprise any geometry so as to provide a guide face that is aligned transverse to the mount face of the boring head.
- the at least one guide block may be formed as a triangular prism having a single or dual guide face extending from the apex of the guide block.
- the guide block is generally wedge shaped and is formed as a single piece component.
- the guide block comprises one or a plurality of through bores to receive attachment bolts for mounting the guide block to the mount face. Where the guide block is formed as a triangular prism, a through bore may be formed through each of the two guide faces of the prism.
- the guide face may be planar, curved, profiled or comprise channels or directing fins to facilitate the directing of material from the cutting face.
- the guide blocks may be formed from a metal or metal alloy and may comprise a wear resistant, low friction coating on the guide face to facilitate debris transport.
- boring apparatus comprising a raise boring head as claimed herein.
- a method of raise boring comprising providing a self-cleaning raise boring head in which cut material is transported away from the mount face via a plurality of guide blocks formed non-integrally with the saddles and being attached to the mount face independently of the corresponding attachment of the saddles.
- raise boring apparatus comprises a raise boring head indicated generally by reference 105 mounted at one end of an elongate drive shaft 104 that is in turn rotatably driven by a drive rig 103.
- Rig 103 according to the example illustration is mounted at a first underground location 101 being separated from a second underground location 102 by a layer of rock 100.
- a pilot borehole 106 is formed within rock 100 as an initial pilot drilling operation using a pilot bit (not shown) attached to the end of drive shaft 104 (typically formed from end-to-end threaded rods).
- the pilot bit is replaced at the end of the shaft 104 by raise boring head 105 having an appreciably larger diameter than the initial pilot bit so as to create a larger diameter bore 109.
- Both shaft 104 and boring head 105 are mounted centrally on longitudinal axis 111 such that the boring head 105 projects radially outward from axis 111 by a predetermined radius to achieve the desired diameter of bore 109.
- Boring head 105 comprises a main body 110 that mounts a plurality of saddles 107 that in turn mount respective roller cutters 108.
- main body 110 is configured to rotate with each cutter 108 also rotating independently to cut into the rock 100 as the shaft 104 is retracted axially towards rig 103 and the boring head 105 raised vertically into the rock 100 from the second location 102 to first location 101.
- main body 110 is formed as an extendable or modular reaming head in which a central section provides a mounting for side extensions or wings (not shown).
- main body 110 comprises sidewalls 204 and respective attachment couplings 203, 210 positioned to secure the head extensions (not shown) against or opposed to sidewalls 204 so as to extend the diameter of the boring head 105 relative to axis 111.
- Main body 110 comprises a planar mount face indicated generally by reference 200 that comprises a cylindrical through bore 201 (defined by a circular opening 208 within mount face 200) centred on axis 111 and extending axially through the main body 110 from the mount face 200 to a rear face 202 that mounts drive shaft 104 at boring head 105.
- Mount face 200 also comprises a plurality of openings 211 distributed around central bore 201 that at least partially define channels 205 that also extend from mount face 200 to rear face 202. Channels 205 are open at both faces 200, 202 to allow the downward discharge (under gravity) of cut material from the mount face 200 to the rear face 202 to then fall below boring head 105. Accordingly, mount face 200 is divided into a plurality of spokes 209 extending radially from an outer perimeter edge 207 to the central bore 201.
- Each spoke 209 provides a mounting region for one or a plurality of saddles 107 that each mount respectively a roller cutter 108 (removed from figures 2 and 3 for illustrative purposes).
- Each saddle 107 projects upwardly from mount face 200 in a direction of axis 111 and drive shaft 104.
- a guide block 206 is also attached to mount face 200 at a radially inner region of two diametrically opposed spokes 209.
- Guide blocks 206 are positioned radially inside respective saddles 107 so as to be positioned radially intermediate saddles 107 and central axis 111 (and drive shaft 104) during use.
- each guide block 206 is formed as a single piece body in a form of a triangular prism having a base surface 400 mounted in contact with mount face 200 of main body 110.
- a pair of substantially planar inclined guide faces 300a, 300b project upwardly from base surface 400 and together define an apex or ridge 500.
- a pair of generally vertical side faces 501 extend perpendicular to the base surface 400 at each lateral side of the inclined guide faces 300a, 300b. Accordingly, with guide block 206 secured in position at mount face 200, guide faces 300a, 300b extend transverse to the generally horizontal planer mount face 200.
- the elongate apex 500 is aligned with the radially extending spoke 209 on which the guide block 206 is mounted and also a corresponding rotational axis (also extending in a radial direction from axis 111) about which the roller cutter 108 is configured to rotate when mounted at saddle 107 positioned radially outside and adjacent guide block 206 on the same spoke 209.
- guide faces 300a, 300b are inclined upwardly from the lateral sides 303 of spoke 209 such that cut material is configured to slide downwardly over faces 300a, 300b to then fall into each channel 205 to each lateral side 303 of spoke 209.
- Each guide block 206 comprises a pair of through bores 301 that extend from each respective guide face 300a, 300b to base surface 400 so as to receive attachment bolts (not shown) to releasably attach each guide block 206 to main body 110 via mount face 200.
- the bolts (not shown) are secured within threaded bores 401 extending axially into main body 110 from mount face 200.
- Corresponding threaded bores 402 are also provided on each spoke 209 so as to releasably attach saddle 107 via separate corresponding bolts received through respective bores 302 formed through a base region of saddle 107.
- mount face 200 By configuring mount face 200 with a plurality of threaded bores 401, 402 at different locations, and via the appropriate attachment bolts (not shown) guide blocks 206 and saddles 107 are independently and interchangeably mounted at main body 110.
- each guide block 206 projects upwardly from mount face 200 by a distance A corresponding to the vertical height of apex ridge 500 from mount face 200.
- Each saddle 107 comprises a pair of upstanding arms 600 to receive roller cutter 108 therebetween for rotation about axis 603.
- Each arm 600 comprises an uppermost end 601 that extends vertically above mount face 200 by a distance B.
- Roller cutter 108 comprises a plurality of cutting inserts 602 that represent the leading uppermost components of cutter 108 being configured to engage and cut the rock 100. Cutting inserts 602 are separated by a maximum distance C from mount face 200 as the cutter 108 rotates about axis 603.
- guide block 206 is mounted (in the axial height direction) below the uppermost cutting region of the cutters 108 and the uppermost end 601 of saddles 107 so as to avoid damage to the guide block 206 due to contact with the rock face 100 and a reduction in the cutting efficiency and boring rate of head 105.
- apex 500 is positioned in the lower half of the height of saddle 107 and significantly below the upper cutting region of cutter 108.
- distance A is approximately 30 to 40 % of distance B and 25 to 37% of distance C.
- a length of guide blocks 206 is less than a corresponding length of each saddle 107 in a radial direction of spoke 209.
- a length of guide block 206 is slightly greater than half of the length of saddle 107.
- guide blocks 206 are configured to prevent accumulation of debris at the radially inner region of the mount face 200 by directing the cut material into the channels 205 via guide faces 300a, 300b.
- guide blocks 206 may comprise generally curved guide faces 300a, 300b where the curvature may be concave or convex in the axial direction perpendicular to mount face 200. Additionally, each guide block 206 may comprise a single guide face (300a or 300b) or may comprises a plurality of guide faces where the guide block is formed as a polyhedron. According to further embodiments, guide blocks 206 may be removably positioned towards the perimeter edge 207 so as to avoid the accumulation of debris material at the perimeter of the main body 110 and between the main body 110 and an extension body (not shown) attached at one or more of the sidewalls 204.
- the present reaming head may comprise a plurality of the same of different shaped guide blocks 206 and may comprise a symmetrical or asymmetrical distribution of guide blocks 206 at mount face 200.
Description
- The present invention relates to a raise boring head and in particular, although not exclusively, to a boring head having a mount face to mount a plurality of roller cutters with at least one guide block projecting from the mount face to facilitate the transport of cut material away from the mount face.
- Raise boring operations may be performed in a mine or other underground works to provide access or to create ventilation shafts. The technique typically involves drilling a small diameter pilot hole from a first location to a second location. Once completed, the pilot bit is removed and a large diameter raise boring head is mounted at the drive shaft, with the shaft having a diameter corresponding to that of the pilot hole. The raise head is rotated and drawn upwardly along the pilot hole so as to enlarge the initial hole to the desired diameter.
- Raise boring apparatus is accordingly subject to extreme operating forces and high-performance components are required to endure the harsh working environment and the physical and mechanical demands during cutting. The raise boring head includes replaceable roller cutters distributed over a mount face of the head that act to disintegrate the rock as they rotate independently. Accordingly, the distribution and configuration of the cutters at the boring head may be adapted in an attempt to maximise cutting performance whilst extending, as far as possible, their operational lifetime. Conventional raise bore apparatus is described in
US 4,228,863 ;US 4,386,670 andUS 4,381,038 . - One problem with conventional boring heads is the accumulation of cut debris at the region around the roller cutters. Regrinding of accumulated debris impedes cutting efficiency and accelerates cutter wear.
US 4,179,000 describes a raise boring head having a generally conical main plate to mount the roller cutters in an attempt to prevent the build-up of cuttings and provide a self-cleaning head. However, via the conical mounting face, the roller cutters are configured to engage the rock at different respective axial height positions (relative to the drive shaft) and this is disadvantageous for a number of reasons. In particular, differential cutter wear necessitates interchange or premature replacement of the radially innermost cutters that are subject to greater stresses and compressive forces. Additionally, localised debris accumulation at the region of the saddles remains problematic and affects certain cutters of the array depending upon their position at the mount face. Accordingly, what is required is a raise boring head that addresses the above problems. - It is an objective of the present invention to provide a raise boring head for rotary boring that is optimised for cutting efficiency including in particular maximising the boring rate whilst extending, as far as possible, the service lifetime of the roller cutters. The objectives are achieved by providing a raise boring head that greatly facilitates the transport of cut material away from the active cutting face of the head to avoid debris accumulation at the region around, between or to the lateral sides of the roller cutters. Advantageously, the subject invention provides a raise boring head in which a face of a body that mounts the roller cutters comprises at least one or a plurality of guide blocks that project from the mount face. The guide blocks each comprise at least one guide surface being aligned transverse to the mount face of the body to facilitate the rearward transport of cut material during boring. Optionally, the body of the boring head may comprise one or a plurality of open channels extending axially through the body from the mount face to a rear face with a corresponding guide block positioned immediately adjacent the open end of the channel so as to direct or funnel cut material into the channel to fall under gravity downwardly away from the cutters.
- According to a first aspect of the present invention there is provided a raise boring head for rotary boring in rock comprising: a body mountable at a drive shaft, the body having a mount face to extend radially outward from the shaft; a plurality of saddles provided at the mount face to rotatably mount respective roller cutters at the body; characterised by: at least one guide block attached to the body to project from the mount face at a position adjacent or spaced apart from the saddles, the guide block having at least one guide face aligned transverse to the mount face to facilitate the transport of cut material away from the mount face.
- Reference within this specification to the 'mount face' of the body encompasses a surface region of the body that is aligned generally perpendicular to the drive shaft and accordingly a central axis extending through the boring head and the drive shaft. The mount face may however be aligned transverse to the central axis so as to be inclined or declined relative to the drive shaft. Additionally, the mount face may be formed as a generally planar surface region having one or a plurality openings or holes that represent open ends of the debris flow channels that extend axially through the body from the mount face to a rear face. The mount face therefore may be formed as sections or regions of a grid or lattice structure that support the saddles and roller cutters.
- Reference within this specification to the 'body' encompasses a raise boring head that may be extendable and formed as a modular, segmented reaming head. Alternatively, the boring head may be formed as an integral reaming head in which a single body is mounted directly to the drive shaft. Where the raise boring head is extendable, the drive shaft is mounted at the extension bodies indirectly.
- Preferably, the roller cutters and saddles are mounted at the head such that the uppermost cutting region of the cutters are aligned at the same axial height (relative to the drive shaft) and separation distance from the mount face. Such an arrangement is advantageous to promote uniform wear of the cutters at the different radial positions on the mount face.
- Optionally, the guide face is generally planar and inclined relative to the mount face. Optionally, the guide face may be curved relative to the mount face or comprise a curved region. The inclined or curved mount face acts to provide a surface over which the cuttings can pass (slide) under gravity as they are cut and ejected from the rock face by the rotating cutters. The inclination or curvature also acts to direct the cuttings to a particular discharge location such as over an inner or outer peripheral edge of the body or through an open channel extending axially through the body.
- Preferably, the guide block is separate to and formed non-integrally with the saddles. Optionally, the boring head further comprises at least one attachment bolt to secure the guide block to the mount face. Such an arrangement is advantageous to allow convenient and adjustable interchange and potential repositioning of the guide block(s) at the mount face to suit particular distributions of roller cutters at the body. For example, it may be desirable for a user to adjust the position of one or more guide blocks following a period of initial boring and the observation of any particular debris accumulation zones that may be dependent upon the rock type, the orientation of the boring and any other factors such as variations in the roller cutter configuration or stratum. Preferably each of the saddles are secured to the mount face via attachment bolts that are separate and independent to the attachment of the at least one guide block to the mount face via at least one respective attachment bolt.
- Optionally, the guide blocks may be secured to the mount face by a weld material. Additionally, the guide blocks may be secured by any other permanent or reasonable attachment mechanisms including locking pins, tongue and groove arrangements, twist lock engagements, bayonet fixings etc.
- Preferably, the guide block projects from the mount face by a distance that is less than a distance by which at least some of the saddles project from the mount face. Preferably, the guide block projects from the mount face by a distance that is less than a distance by which the closest neighbouring saddle to the guide block projects from the mount face. Optionally, at least some of the saddles may be recessing into the mount face. More preferably, the guide block projects from the mount face by a distance that is less than a distance by which each of the roller cutters project from the mount face. Such an arrangement is advantageous to avoid direct contact with the rock and accordingly the premature wear of the guide block. Preferably, the at least one guide block comprises a height that is less than half of the height of a saddle such that the roller cutters are mounted to stand proud of the guide blocks. Optionally, the at least one guide block projects from the mount face by a distance that is 10 to 50%, 15 to 45% or 25 to 40% of a distance by the saddles project from the mount face. Additionally, the at least one guide block may project from the mount face by a distance that is 10 to 50%, 15 to 45% or 25 to 40% of a distance by the roller cutters project from the mount face.
- Preferably, the boring head comprises one or a plurality of open channels extending axially through the body from the mount face to a rear face. Preferably, the guide block or a plurality of guide block are positioned at the mount face adjacent an open end of the channel(s) to deflect cut material into the channel for transport from the mount face to the rear face. Optionally, a single guide block may be positioned laterally to one side of each open end of the channel or a plurality of guide blocks may be positioned adjacent the channel open end. Optionally, the guide block may be positioned at or towards a perimeter edge of the mount face representing the radially outermost region of a boring head. Optionally, the guide block may be positioned at a radially inner region of the mount face adjacent the drive shaft. Such configurations can accordingly be optimised to maximise the through transport of cuttings away from the mount face at zones where debris accumulation may be problematic due to a particular distribution of roller cutters at the body. It is preferable that the guide blocks are positioned at the mount face circumferentially or radially between the saddles where the saddles may be distributed at the same or different respective circumferential and radial spacing relative to one another. Optionally, the guide blocks may be positioned asymmetrically or symmetrically at the mount face with respect to the distribution of roller cutters (and saddles).
- Optionally, where the boring head is modular, the body may comprise a main body (or hub) and at least one extension body removably mounted to a lateral side of the main body, the extension body having a corresponding mount face to provide a radial extension of the mount face of the main body. Optionally, the boring head may comprise the same or different extension bodies mountable at the lateral sides of the main body. Optionally, the boring head comprises a plurality of a first type of extension bodies and a plurality of a second type of extension bodies so as to radially extend the mount face and the operative cutting diameter of the boring head. Accordingly, the present raise boring head may be extendable and may be formed as a modular, segmented reaming head. Alternatively, the boring head may be formed as an integral reaming head in which a single body mounts a plurality of roller cutters and one or a plurality of guide blocks.
- Optionally, where the boring head is segmented or extendable via one or more extension bodies, the boring head may comprise a guide block or a plurality of guide blocks positioned at the mount face of the main body and/or the extension body radially inside or radially outside the saddles. Such a configuration facilitates the deflection of cut material away from the mount face at all regions of the boring head including radially inner and radially outer sections.
- As will be appreciated, the guide block according to the subject invention may comprise any geometry so as to provide a guide face that is aligned transverse to the mount face of the boring head. Optionally, the at least one guide block may be formed as a triangular prism having a single or dual guide face extending from the apex of the guide block. Optionally, the guide block is generally wedge shaped and is formed as a single piece component. Optionally, the guide block comprises one or a plurality of through bores to receive attachment bolts for mounting the guide block to the mount face. Where the guide block is formed as a triangular prism, a through bore may be formed through each of the two guide faces of the prism. Optionally, the guide face may be planar, curved, profiled or comprise channels or directing fins to facilitate the directing of material from the cutting face. Optionally, the guide blocks may be formed from a metal or metal alloy and may comprise a wear resistant, low friction coating on the guide face to facilitate debris transport.
- According to a second aspect of the present invention there is provided boring apparatus comprising a raise boring head as claimed herein.
- According to a third aspect of the present invention there is provided a method of raise boring comprising providing a self-cleaning raise boring head in which cut material is transported away from the mount face via a plurality of guide blocks formed non-integrally with the saddles and being attached to the mount face independently of the corresponding attachment of the saddles.
- A specific implementation of the present invention will now be described, by way of example only, and with reference to the accompanying drawings in which:
-
Figure 1 is a schematic illustration of raise boring apparatus to create a borehole between a first and a second underground location using a boring head that mounts a plurality of roller cutters; -
Figure 2 is a perspective view of a main body of the boring head offigure 1 mounting a plurality of saddles that in turn mount the roller cutters (removed for illustrative purposes) and a pair of guide blocks to facilitate the discharge of cut material away from the boring head during cutting according to a specific implementation of the present invention; -
Figure 3 is a magnified perspective view of the guide blocks and a mount face of the main body offigure 2 ; -
Figure 4 is a further perspective view of the main body offigure 3 with the saddles removed for illustrative purposes; -
Figure 5 is a perspective view of one of the guide blocks offigure 4 ; -
Figure 6 is a side elevation view of one of the guide blocks, saddles and roller cutters attached to the mount face of the main body offigure 4 . - Referring to
figure 1 , raise boring apparatus comprises a raise boring head indicated generally byreference 105 mounted at one end of anelongate drive shaft 104 that is in turn rotatably driven by adrive rig 103. Rig 103 according to the example illustration is mounted at a firstunderground location 101 being separated from a secondunderground location 102 by a layer ofrock 100. Apilot borehole 106 is formed withinrock 100 as an initial pilot drilling operation using a pilot bit (not shown) attached to the end of drive shaft 104 (typically formed from end-to-end threaded rods). Following the creation of the pilot bore 106, the pilot bit is replaced at the end of theshaft 104 byraise boring head 105 having an appreciably larger diameter than the initial pilot bit so as to create a larger diameter bore 109. Bothshaft 104 andboring head 105 are mounted centrally onlongitudinal axis 111 such that theboring head 105 projects radially outward fromaxis 111 by a predetermined radius to achieve the desired diameter ofbore 109.Boring head 105 comprises amain body 110 that mounts a plurality ofsaddles 107 that in turn mountrespective roller cutters 108. Asshaft 104 is rotated viarig 103,main body 110 is configured to rotate with eachcutter 108 also rotating independently to cut into therock 100 as theshaft 104 is retracted axially towardsrig 103 and theboring head 105 raised vertically into therock 100 from thesecond location 102 tofirst location 101. - Referring to
figure 2 ,main body 110 is formed as an extendable or modular reaming head in which a central section provides a mounting for side extensions or wings (not shown). In particular,main body 110 comprisessidewalls 204 andrespective attachment couplings boring head 105 relative toaxis 111.Main body 110 comprises a planar mount face indicated generally byreference 200 that comprises a cylindrical through bore 201 (defined by acircular opening 208 within mount face 200) centred onaxis 111 and extending axially through themain body 110 from themount face 200 to arear face 202 that mountsdrive shaft 104 atboring head 105. Mount face 200 also comprises a plurality ofopenings 211 distributed aroundcentral bore 201 that at least partially definechannels 205 that also extend frommount face 200 torear face 202.Channels 205 are open at bothfaces mount face 200 to therear face 202 to then fall belowboring head 105. Accordingly, mountface 200 is divided into a plurality ofspokes 209 extending radially from anouter perimeter edge 207 to thecentral bore 201. - Each spoke 209 provides a mounting region for one or a plurality of
saddles 107 that each mount respectively a roller cutter 108 (removed fromfigures 2 and3 for illustrative purposes). Eachsaddle 107 projects upwardly frommount face 200 in a direction ofaxis 111 and driveshaft 104. According to the specific implementation, aguide block 206 is also attached to mountface 200 at a radially inner region of two diametricallyopposed spokes 209. Guide blocks 206 are positioned radially insiderespective saddles 107 so as to be positioned radiallyintermediate saddles 107 and central axis 111 (and drive shaft 104) during use. - Referring to
figures 3 to 5 , eachguide block 206 is formed as a single piece body in a form of a triangular prism having abase surface 400 mounted in contact withmount face 200 ofmain body 110. A pair of substantially planar inclined guide faces 300a, 300b project upwardly frombase surface 400 and together define an apex orridge 500. A pair of generally vertical side faces 501 extend perpendicular to thebase surface 400 at each lateral side of the inclined guide faces 300a, 300b. Accordingly, withguide block 206 secured in position atmount face 200, guide faces 300a, 300b extend transverse to the generally horizontalplaner mount face 200. According to the specific implementation, theelongate apex 500 is aligned with the radially extending spoke 209 on which theguide block 206 is mounted and also a corresponding rotational axis (also extending in a radial direction from axis 111) about which theroller cutter 108 is configured to rotate when mounted atsaddle 107 positioned radially outside andadjacent guide block 206 on thesame spoke 209. Accordingly, guide faces 300a, 300b are inclined upwardly from thelateral sides 303 ofspoke 209 such that cut material is configured to slide downwardly overfaces channel 205 to eachlateral side 303 ofspoke 209. - Each
guide block 206 comprises a pair of throughbores 301 that extend from eachrespective guide face base surface 400 so as to receive attachment bolts (not shown) to releasably attach each guide block 206 tomain body 110 viamount face 200. The bolts (not shown) are secured within threadedbores 401 extending axially intomain body 110 frommount face 200. Corresponding threadedbores 402 are also provided on each spoke 209 so as to releasably attachsaddle 107 via separate corresponding bolts received throughrespective bores 302 formed through a base region ofsaddle 107. - By configuring
mount face 200 with a plurality of threadedbores main body 110. - Referring to
figure 6 , each guide block 206 projects upwardly frommount face 200 by a distance A corresponding to the vertical height ofapex ridge 500 frommount face 200. Eachsaddle 107 comprises a pair ofupstanding arms 600 to receiveroller cutter 108 therebetween for rotation aboutaxis 603. Eacharm 600 comprises anuppermost end 601 that extends vertically abovemount face 200 by a distanceB. Roller cutter 108 comprises a plurality of cuttinginserts 602 that represent the leading uppermost components ofcutter 108 being configured to engage and cut therock 100. Cutting inserts 602 are separated by a maximum distance C frommount face 200 as thecutter 108 rotates aboutaxis 603. It is desirable thatguide block 206 is mounted (in the axial height direction) below the uppermost cutting region of thecutters 108 and theuppermost end 601 ofsaddles 107 so as to avoid damage to theguide block 206 due to contact with therock face 100 and a reduction in the cutting efficiency and boring rate ofhead 105. Accordingly, apex 500 is positioned in the lower half of the height ofsaddle 107 and significantly below the upper cutting region ofcutter 108. In particular, distance A is approximately 30 to 40 % of distance B and 25 to 37% of distance C. Additionally, according to the specific implementation, a length of guide blocks 206 is less than a corresponding length of eachsaddle 107 in a radial direction ofspoke 209. In particular and according to the specific implementation, a length ofguide block 206 is slightly greater than half of the length ofsaddle 107. According to the specific embodiment offigures 2 to 6 , guide blocks 206 are configured to prevent accumulation of debris at the radially inner region of themount face 200 by directing the cut material into thechannels 205 via guide faces 300a, 300b. - According to further specific embodiments, guide blocks 206 may comprise generally curved guide faces 300a, 300b where the curvature may be concave or convex in the axial direction perpendicular to mount
face 200. Additionally, each guide block 206 may comprise a single guide face (300a or 300b) or may comprises a plurality of guide faces where the guide block is formed as a polyhedron. According to further embodiments, guide blocks 206 may be removably positioned towards theperimeter edge 207 so as to avoid the accumulation of debris material at the perimeter of themain body 110 and between themain body 110 and an extension body (not shown) attached at one or more of thesidewalls 204. - The present reaming head may comprise a plurality of the same of different shaped guide blocks 206 and may comprise a symmetrical or asymmetrical distribution of guide blocks 206 at
mount face 200.
Claims (14)
- A raise boring head (105) for rotary boring in rock (100) comprising:a body (110) mountable at a drive shaft (104), the body (110) having a mount face (200) to extend radially outward from the shaft (104);a plurality of saddles (107) provided at the mount face (200) to rotatably mount respective roller cutters (108) at the body (110);at least one guide block (206) attached to the body (110) to project from the mount face (200) at a position adjacent or spaced apart from the saddles (107), the guide block (206) having at least one guide face (300a, 300b) aligned transverse to the mount face (200) to facilitate the transport of cut material away from the mount face (200);characterised by:
wherein the guide block (206) is separate to and formed non-integrally with the saddles (107). - The boring head as claimed in claim 1 wherein the guide face (300a, 300b) is generally planar and inclined relative to the mount face (200) or is curved relative to the mount face (200).
- The boring head as claimed in claims 1 or 2 wherein the mount face (200) extends generally perpendicular to the drive shaft (104).
- The boring head as claimed in any preceding claim further comprising at least one attachment bolt to secure the guide block (206) to the mount face (200).
- The boring head as claimed in any one of claims 1 to 3 wherein the guide block (206) is secured to the mount face (200) via weld material.
- The boring head as claimed in any preceding claim wherein the guide block (206) projects from the mount face (200) by a distance (A) that is less than a distance (B) by which at least some of the saddles (107) project from the mount face (200).
- The boring head as claimed in any preceding claim wherein the guide block (206) projects from the mount face (200) by a distance (A) that is less than a distance (C) by which each of the roller cutters (108) project from the mount face (200).
- The boring head as claimed in any preceding claim comprising at least one open channel (205) extending axially through the body (110) from the mount face (200) to a rear face (202).
- The boring head as claimed in claim 8 wherein the guide block (206) is positioned at the mount face (200) adjacent an open end (211) of the channel (205) to deflect cut material into the channel (205) for transport from the mount face (200) to the rear face (202).
- The boring head as claimed in any preceding claim comprising a plurality of guide blocks (206) positioned at the mount face (200) between the saddles (107).
- The boring head as claimed in any preceding claim wherein the body (110) is a main body (110) and the boring head further comprises at least one extension body removably mounted to a lateral side of the main body (110), the extension body having a corresponding mount face to provide a radial extension of the mount face (200) of the main body (110).
- The boring head as claimed in claim 11 comprising at least one guide block (206) provided at the mount face of the extension body.
- The boring head as claimed in any preceding claim comprising a guide block (206) positioned at the mount face (200) radially inside or radially outside the saddles (107).
- The boring head as claimed in any preceding claim wherein the guide block (206) comprises a geometry being a triangular prism.
Priority Applications (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES15170073.9T ES2684098T3 (en) | 2015-06-01 | 2015-06-01 | Drilling head for rotary drilling |
PT15170073T PT3101216T (en) | 2015-06-01 | 2015-06-01 | Boring head for rotary boring |
EP15170073.9A EP3101216B1 (en) | 2015-06-01 | 2015-06-01 | Boring head for rotary boring |
US15/578,673 US11028649B2 (en) | 2015-06-01 | 2016-05-09 | Raise boring head for rotary boring |
CA2987492A CA2987492C (en) | 2015-06-01 | 2016-05-09 | Raise boring head for rotary boring |
PCT/EP2016/060254 WO2016192928A1 (en) | 2015-06-01 | 2016-05-09 | Raise boring head for rotary boring |
RU2017145848A RU2707217C2 (en) | 2015-06-01 | 2016-05-09 | Head for rotary drilling of rising formation |
AU2016270222A AU2016270222B2 (en) | 2015-06-01 | 2016-05-09 | Raise boring head for rotary boring |
CN201680032112.2A CN107667204B (en) | 2015-06-01 | 2016-05-09 | Reverse boring head for rotary drilling |
ZA2017/08161A ZA201708161B (en) | 2015-06-01 | 2017-11-30 | Raise boring head for rotary boring |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP15170073.9A EP3101216B1 (en) | 2015-06-01 | 2015-06-01 | Boring head for rotary boring |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3101216A1 EP3101216A1 (en) | 2016-12-07 |
EP3101216B1 true EP3101216B1 (en) | 2018-05-16 |
Family
ID=53276769
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15170073.9A Active EP3101216B1 (en) | 2015-06-01 | 2015-06-01 | Boring head for rotary boring |
Country Status (10)
Country | Link |
---|---|
US (1) | US11028649B2 (en) |
EP (1) | EP3101216B1 (en) |
CN (1) | CN107667204B (en) |
AU (1) | AU2016270222B2 (en) |
CA (1) | CA2987492C (en) |
ES (1) | ES2684098T3 (en) |
PT (1) | PT3101216T (en) |
RU (1) | RU2707217C2 (en) |
WO (1) | WO2016192928A1 (en) |
ZA (1) | ZA201708161B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201900003721A1 (en) * | 2019-03-14 | 2020-09-14 | Hpm Hydraulic Performance Machines S R L | ROCK CRUSHING UNIT TO ENLARGE A PILOT HOLE CARRIED OUT ON ROCKY SOIL |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
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US3638740A (en) * | 1970-03-30 | 1972-02-01 | Murphy Ind Inc G W | Raise drilling bit |
US3858667A (en) * | 1973-11-01 | 1975-01-07 | Kennametal Inc | Big hole cutter |
US4142598A (en) * | 1977-05-23 | 1979-03-06 | Smith International, Inc. | Two stage large diameter drill bit |
SE414955B (en) | 1977-09-09 | 1980-08-25 | Sandvik Ab | STIGORTS DRIVING CHRONICLE |
SU735781A1 (en) * | 1977-10-20 | 1980-05-25 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Горнорудного Машиностроения | Expander |
US4179000A (en) | 1978-06-05 | 1979-12-18 | Dresser Industries, Inc. | Self-cleaning raise boring head system |
SE463110B (en) * | 1979-02-02 | 1990-10-08 | Sandvik Ab | SETTING AND DEVICE FOR STIGORTS DRIVING |
SU829914A1 (en) * | 1979-07-11 | 1981-05-15 | Всесоюзный Научно-Исследовательскийи Проектно-Конструкторский Институтгорнорудного Машиностроения | Well-expanding device |
US4301876A (en) * | 1979-08-24 | 1981-11-24 | Smith International, Inc. | Non-rotating stabilizer for raise boring |
AU539398B2 (en) | 1980-05-27 | 1984-09-27 | Sandvik Ab | Boring head |
US4381038A (en) * | 1980-11-21 | 1983-04-26 | The Robbins Company | Raise bit with cutters stepped in a spiral and flywheel |
US4456082A (en) * | 1981-05-18 | 1984-06-26 | Smith International, Inc. | Expandable rock bit |
US4697652A (en) * | 1986-09-19 | 1987-10-06 | Reed Mining Tools, Inc. | Reversible roller stabilizer extensions for earth boring head |
US4832135A (en) * | 1988-02-29 | 1989-05-23 | Baker Hughes Incorporated | Flow through raise boring bit |
SE522830C2 (en) * | 2001-12-10 | 2004-03-09 | Sandvik Ab | Drilling head for rotary drilling as well as saddle and cutting roller therefore |
US8191635B2 (en) * | 2009-10-06 | 2012-06-05 | Baker Hughes Incorporated | Hole opener with hybrid reaming section |
-
2015
- 2015-06-01 EP EP15170073.9A patent/EP3101216B1/en active Active
- 2015-06-01 ES ES15170073.9T patent/ES2684098T3/en active Active
- 2015-06-01 PT PT15170073T patent/PT3101216T/en unknown
-
2016
- 2016-05-09 US US15/578,673 patent/US11028649B2/en active Active
- 2016-05-09 RU RU2017145848A patent/RU2707217C2/en active
- 2016-05-09 AU AU2016270222A patent/AU2016270222B2/en active Active
- 2016-05-09 WO PCT/EP2016/060254 patent/WO2016192928A1/en active Application Filing
- 2016-05-09 CN CN201680032112.2A patent/CN107667204B/en active Active
- 2016-05-09 CA CA2987492A patent/CA2987492C/en active Active
-
2017
- 2017-11-30 ZA ZA2017/08161A patent/ZA201708161B/en unknown
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
US20180223600A1 (en) | 2018-08-09 |
CN107667204A (en) | 2018-02-06 |
ES2684098T3 (en) | 2018-10-01 |
CA2987492C (en) | 2023-08-08 |
AU2016270222B2 (en) | 2020-12-10 |
EP3101216A1 (en) | 2016-12-07 |
CN107667204B (en) | 2020-08-18 |
AU2016270222A1 (en) | 2017-12-14 |
WO2016192928A1 (en) | 2016-12-08 |
US11028649B2 (en) | 2021-06-08 |
PT3101216T (en) | 2018-10-08 |
CA2987492A1 (en) | 2016-12-08 |
RU2017145848A3 (en) | 2019-09-13 |
RU2707217C2 (en) | 2019-11-25 |
ZA201708161B (en) | 2019-09-25 |
RU2017145848A (en) | 2019-07-12 |
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